If your style is passive and he's aggro, then you're simply not going to win heads up, don't try to. Playing good players wins much respect and little money, playing bad players wins little respect and much money. Remember that.
Okay, didn't get that this was a tournament. Heads up it's simple. Everything's on steroids, just bash heads and see who comes out on top. If the blinds/antes are large enough that the M's are down, and this guy really is going to put the pressure on you, take any K2+ 22+ and get it in with him, those will all win +50% against a random holding. Hu is about big cards, KJ is suddenly a powerhouse, and Ace high will often win after all the cards are out. You really need to have accumulated enough chips before now to have a solid shot at winning a tournament. If you're at a 3:1 chip disadvantage, you have to be honest about your chances, they aren't good. So, take what you can get, learn to be aggressive, and improve.